docs: def to_dict(self):
          """
          Returns a dict representation of this instance suitable for
          conversion to YAML.
  
          """
          return {
              'model_type': 'segmented_discretechoice',
              'name': self.name,
              'segmentation_col': self.segmentation_col,
              'sample_size': self.sample_size,
              'probability_mode': self.probability_mode,
              'choice_mode': self.choice_mode,
              'choosers_fit_filters': self.choosers_fit_filters,
              'choosers_predict_filters': self.choosers_predict_filters,
              'alts_fit_filters': self.alts_fit_filters,
              'alts_predict_filters': self.alts_predict_filters,
              'interaction_predict_filters': self.interaction_predict_filters,
              'estimation_sample_size': self.estimation_sample_size,
              'prediction_sample_size': self.prediction_sample_size,
              'choice_column': self.choice_column,
              'default_config': {
                  'model_expression': self.default_model_expr,
              },
              'remove_alts': self.remove_alts,
              'fitted': self.fitted,
              'models': {
                  yamlio.to_scalar_safe(name):
                      self._process_model_dict(m.to_dict())
                  for name, m in self._group.models.items()
              }
          }